you have to start Xfree86 normally, without a window manager... Then after its running export the correct display information for ggi (read the doc on www.ggi-project.org to see what i mean about display info) and then start multiple times and they will display INSIDE of Xfree86... kind of like Xnest does

I suppose we are not the only one who wish they could use their NV dualheadcards just like two individual singlehead cards...
Is this support to be programmed in a near future? Would be a good idea, imho.